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0 <br />reported that adult razorback sucker are more vulnerable to capture in spring. <br />Electrofishing and entanglement nets would be primarily used, although fish <br />traps might also be used in some locations. Habitats that would be searched <br />during this time include inundated bottomlands, inundated mouths of tributary <br />0 streams, and backwaters. <br />During spring surveys, recaptured fish would be checked for PIT tags, and <br />their spawning condition noted. Sex ratios of recaptured fish would also be <br />recorded. Recaptured tagged fish would provide information on survival, <br />movement, post-stocking dispersal, periodicity of participation by individual <br />spawners, and recruitment. Recaptured, known-age fish could also provide <br />10 important age and growth information useful in developing aging techniques for <br />wild fish. <br />Razorback sucker spawn in the spring. Verification of successful <br />spawning and recruitment would be conducted annually by sampling in and around <br />suspected spawning areas and reaches downstream with small larval and <br />post-larval size nets following the spawning period. Sampling would be <br />performed periodically, from early summer to fall. The sampling design used <br />to accomplish this task would follow those developed and described in the ISMP <br />handbook. <br />Stocking of adult razorback sucker would be coordinated with other <br />agencies and cooperators performing field work in the upper Colorado River. <br />Field workers that encounter razorback sucker during the spring Standardized <br />Monitoring Program would be requested to inspect these fish for PIT tags and <br />obtain sex and growth information. If fish are released into riverine areas <br />where current standardized monitoring is not being conducted, additional <br />sampling and monitoring would have to be conducted in those reaches for these <br />35 <br />b